How Is Ben Alive and in The Sparrow Academy?
Some people might be wondering why Ben is the sole Hargreeves sibling to make it into the Sparrow Academy, but it's pretty easy to figure out. When Sir Reginald meets the six siblings for their dinner, he notes down all their names and abilities except for Ben. Other than for the obvious reason that Ben is dead and can't introduce himself, none of the siblings want to discuss their deceased brother; they don't give Sir Reginald his name or his ability. Klaus even refuses to tell anyone that Ben is still hanging around as his ghostly companion. So when Sir Reginald was going around, adopting his batch of children, he didn't know that he was selecting the same child he had before. And sadly enough, it's obvious that Ben benefited from his choices this time around — he's still alive!